Getting gray colored lines in a line plot

Hi,

so I have this plot and there are several lines that I need to plot and I would like some of them to be black, some colored (I know how to do that) and some gray. So how do I get the gray color? And, also, how do I control it? I would like some of the gray lines to be darker and some lighter.

Thank You in advance!

Answer 1

[Azzi Abdelmalek]

plot(t,y,'color',[0,0,0 ]) % Black
plot(t,y,'color',[0,0,0]+alpha) % for alpha= 0 to 1 the lines will be more clear

 % example
 t=0:0.1:10;y=sin(t)
 for k=1:20
 plot(t,y,'linewidth',8,'Color',[0 0 0]+0.05*k);pause(0.5);
 end

[Marenostre]

great!!

[Muhammad Zayed]

That's exactly what I am looking for! Thanks a lot!

[Jonathan Arias]

beautiful! it works!

[Juan Agullo]

Thanks! works really well